These are ruby mouse feet, not glass. I only tried them on, and haven't used them as soles. The accessories are unused, as shown in the images. This material, which boasts extremely high hardness, wear resistance, and lubricity, is used in the bearings of luxury watches. You can achieve a more controllable feel than with PTFE or ultra-high molecular weight polyethylene, and the flat spherical shape is suitable for soft mouse pads, providing a very smooth experience. Both ruby and sapphire are crystals of aluminum oxide (Al2O3), and their colors differ due to the difference in impurity ions. There is almost no difference other than color for mouse foot applications. Accessories: - 5 SAPPHIRESKATES - Microfiber cloth - Alcohol pad - 15 pre-cut double-sided tapes (spare) - Sandpaper - Case